Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 9, Problem 16P
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Determine the PTSF in each direction for a 4.5 mi (7.2 km) two-lane highway segmentin level terrain. Traffic volumes (two-way) are 1100 veh/h. Trucks: 10%; RVs: 7%; PHF:0.97; directional split: 60/40; no passing zones: 40%.
An existing urban freeway with 4 lanes in each direction has the following characteristics.
Traffic data:
Peak hour volume (in the peak direction):
Trucks:
PHF = 0.93
Geometric data:
LOS A
OLOS B
LOS C
LOS D
LOS E
LOS F
Lane width:
Shoulder width:
Total ramp density:
Terrain: rolling
11 ft
6 ft
1.8 ramps per mile
Determine the LOS in the peak hour. (Assume commuter traffic and assume no RVs.)
7,090 veh/h
10% of peak hour volume
Show the demand flow rate (in pc/h/In), mean speed (in mi/h), and density (in pc/mi/In) for the given conditions.
demand flow rate
2191
pc/h/In
mean speed
density
50 X mi/h
43.82 X pc/mi/In
determine PTSF and ATS in the peak direction if northbound volume is 1000 veh/h and southbound
volume is 600 veh/h. 4.5 mi two-lane highway segment in level terrain Traffic volumes (two-way) are
1100 veh/h. Trucks: 10%, RVs: 7%, PHF: 0.97, directional split: 60/40, and no-passing zones: 40%. Base
free flow speed: 55 mi/h, lane width: 11 ft, shoulder width: 3 ft, and access points/mi: 15.
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